US12028849B2 - User equipment and system performing transmission and reception operations - Google Patents

User equipment and system performing transmission and reception operations Download PDF

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US12028849B2
US12028849B2 US17/375,938 US202117375938A US12028849B2 US 12028849 B2 US12028849 B2 US 12028849B2 US 202117375938 A US202117375938 A US 202117375938A US 12028849 B2 US12028849 B2 US 12028849B2
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message
time window
time
plural
periodicity
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US20210345367A1 (en
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Ming-Hung TAO
Hidetoshi Suzuki
Rikin Shah
Quan KUANG
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Panasonic Intellectual Property Corp of America
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Panasonic Intellectual Property Corp of America
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • the 3rd Generation Partnership Project (3GPP) works at technical specifications for the next generation cellular technology, which is also called fifth generation (5G) including “New Radio” (NR) radio access technology (RAT), which operates in frequency ranges up to 100 GHz.
  • 5G next generation cellular technology
  • NR New Radio
  • RAT radio access technology
  • the NR is a follower of the technology represented by Long Term Evolution (LTE) and LTE Advanced (LTE-A).
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • the NR is planned to facilitate providing a single technical framework addressing several usage scenarios, requirements and deployment scenarios defined including, for instance, enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), massive machine type communication (mMTC), and the like.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communications
  • mMTC massive machine type communication
  • eMBB deployment scenarios may include indoor hotspot, dense urban, rural, urban macro and high speed;
  • URLLC deployment scenarios may include industrial control systems, mobile health care (remote monitoring, diagnosis and treatment), real time control of vehicles, wide area monitoring and control systems for smart grids;
  • mMTC may include scenarios with large number of devices with non-time critical data transfers such as smart wearables and sensor networks.
  • One non-limiting and exemplary embodiment facilitates SI message acquisition and may particularly facilitate achieving a flexible, reliable and robust acquisition thereof.
  • the techniques disclosed herein feature a user equipment, UE, comprising a receiver, a transmitter and processing circuitry.
  • the receiver in operation, receives a system information configuration for at least one system information, SI, message, the configuration indicating a periodicity at which the at least one SI message is being broadcasted.
  • the processing circuitry in operation and using the receiver, determines that receiving the at least one SI message, to be broadcasted in one of plural first time windows that are reoccurring at the indicated periodicity, is unsuccessful.
  • the transmitter in operation, transmits a SI request for the at least one SI message after determining the unsuccessful receipt of the at least one SI message, wherein the SI request includes an indication of the at least one SI message to be broadcasted.
  • the receiver in operation, receives the at least one SI message within at least one second time window which occurs after the one of the plural first time windows and before the next of the first time window that is reoccurring at the indicated periodicity, and the processor, in operation, determines that receiving the at least one SI message is successful.
  • FIG. 1 shows an exemplary communication system for 3GPP NR including an exemplary user equipment UE and a system such as a base station BS or gNB;
  • FIGS. 2 and 3 show block diagrams of an exemplary structure of a circuitry of a user equipment and of a circuitry of a gNB;
  • FIG. 4 illustrates a sequence diagram for acquiring a system information (SI) message by a user equipment according to an exemplary implementation
  • FIG. 6 depicts a schematic illustration of a system information (SI) message acquisition mechanism according to a second exemplary embodiment.
  • SI system information
  • the base station may be a gNB (gNodeB, e.g., an NR gNB) or an eNB (eNodeB, e.g., an LTE gNB).
  • gNodeB e.g., an NR gNB
  • eNodeB e.g., an LTE gNB
  • the present disclosure is not limited to these 3GPP systems or to any other systems. Even though the embodiments and exemplary implementations are described using some terminology of 3GPP systems, the present disclosure is also applicable to any other communication systems, and in particular in any cellular, wireless and/or mobile systems.
  • a mobile terminal is referred to in the LTE and NR as a user equipment (UE).
  • UE user equipment
  • This may be a mobile device such as a wireless phone, smartphone, tablet computer, or an USB (universal serial bus) stick with the functionality of a user equipment.
  • the term mobile device is not limited thereto, in general, a relay may also have functionality of such mobile device, and a mobile device may also work as a relay.
  • a base station forms at least part of a system of interconnected units, for instance a (central) baseband unit and different radio frequency units, interfacing different antenna panels or radio heads in the network for providing services to terminals.
  • a base station provides wireless access to terminals.
  • a base station of a 3GPP system is broadcasting system information (SI) in each (radio) cells.
  • SI system information
  • System information is divided into a master information block (MIB) and a number of system information blocks (SIBs). These blocks may be characterized as follows:
  • the MIB is always transmitted on the Broadcast Channel (BCH) with a periodicity of 80 ms and repetitions made within 80 ms and it includes parameters that are needed to acquire SIB1 from the cell.
  • BCH Broadcast Channel
  • the first transmission of the MIB is scheduled in defined subframes and repetitions are scheduled according to the period of Synchronization Signal Block (SSB).
  • SSB Synchronization Signal Block
  • the SIB1 is transmitted on the Downlink-Shared Channel (DL-SCH) with a periodicity of 160 ms and variable transmission repetition periodicity.
  • the default transmission repetition periodicity of SIB1 is 20 ms but the actual transmission repetition periodicity is up to network implementation.
  • SIB1 repetition transmission period is 20 ms.
  • SIB1 transmission repetition period is the same as the SSB period.
  • SIB1 includes information regarding the availability and scheduling (e.g., mapping of SIBs to SI message, periodicity, SI-window size) of other SIBs with an indication whether one or more SIBs are only provided on-demand and, in that case, the configuration needed by the UE to perform the SI request.
  • SIB1 is cell-specific SIB.
  • SIBs other than SIB1 are carried in System Information (SI) messages, which are transmitted on the DL-SCH.
  • SI System Information
  • SI-windows with same length for all SI messages.
  • SI-windows with same length for all SI messages.
  • SI-windows of different SI messages do not overlap.
  • SIB any SIB except SIB1 can be configured to be cell specific or area specific, using an indication in SIB 1.
  • the cell specific SIB is applicable only within a cell that provides the SIB while the area specific SIB is applicable within an area referred to as SI area, which consists of one or several cells and is identified by systemInformationAreaID.
  • the SI acquisition procedure is applied by UEs upon cell selection (e.g., upon power on), cell-reselection, return from out of coverage, after reconfiguration with sync completion, after entering the network from another RAT, upon receiving an indication that the system information has changed, upon receiving a PWS notification; whenever the UE does not have a valid version of a stored SI.
  • the SI message acquisition includes that the UE first transmits a request for on demand system information, and subsequently also receives the PDCCH containing the scheduling RNTI, e.g., SI-RNTI, from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, or until the SI message was received. Also, if the SI message was not received by the end of the SI-window, repeat reception at the next SI-window occasion for the concerned SI message.
  • the scheduling RNTI e.g., SI-RNTI
  • the inventors have recognized the need for a mechanism which facilitates providing a reliable and robust SI acquisition mechanism which may cope with unsuccessful SI message acquisitions and further improve the flexibility in dealing therewith.
  • the system 160 of the exemplary implementation includes a system information configuration transmitter 370 - a , optionally a first system information message transmitter 370 - b , optionally a first system information message transmission determination circuitry 380 - a , a system information request receiver 370 - c , a second system information message transmitter 370 - d , and optionally a second system information message reception determination processing circuitry 380 - b.
  • the transmitters 370 - a , 370 - b and 370 - d , and the receiver 370 - c can be combined in a common receiver/transmitter building block, and the processing circuitry 380 - a and 380 - b can be combined in a common processing circuitry building block as shown in FIG. 1 .
  • the present disclosure assumes that the UE 110 is in communication reach to the system 160 (or gNB) and is operating in a state where at least one system information (SI) message is to be acquired.
  • SI system information
  • the at least SI message shall be understood as carrying one or more system information blocks (SIBs) excluding SIB1 having a same periodicity.
  • the UE 110 determines (see, e.g., step 420 in FIG. 4 ) that it has to acquire a SI message.
  • the SI message acquisition may be triggered for numerous reasons. For example, the UE may determine that system information blocks, which it has previously acquired, are no longer valid. Also, for example, the UE may acquire a change indication indicating that a system information block has been updated.
  • the transmitter 120 of UE 110 receives (see, e.g., step 430 in FIG. 4 ) a system information configuration for at least one system information (SI) message.
  • the system information configuration indicates, among others, the periodicity at which the at least one SI message is being broadcast. For example, this reception operation may be performed by the system information configuration receiver 220 - a of FIG. 2 .
  • the UE 110 may determine the location of the reoccurring at least one first time window by separately inferring the start of the time window and the length of the time window for each of the at least one SI messages.
  • the UE 110 may infer the start of the time window for each of the at least one SI messages from the received system information configuration, e.g., without any explicit signaling therein.
  • the UE 110 may also infer the length of the first time window without any additional information.
  • the length of the time window can be uniformly prescribed to always correspond to 5 slots. Then the UE 110 can infer the location of the first time window without any additional information.
  • the received system information configuration is configuring three SI messages, and the length of each SI message is prescribed to correspond to 1 slot.
  • One of the exemplary three SI messages is configured with a periodicity of 8 radio frames and another of the exemplary three SI messages is configured with a periodicity of 16 radio frames and a third of the three SI messages is configured with a periodicity of 32 radio frames.
  • the UE 110 can infer for each of the three SI messages the radio frame in which it is to be broadcasted based on a system frame number (SFN) which is an integer multiple of the respective periodicity.
  • SFN system frame number
  • the UE 110 can infer those radio frames in which they are to be broadcast, respectively.
  • the UE 110 can determine the start (or starting point) of the first time window for each SI message as a slot with a number which corresponds to the position of the respective entry(ies) which are included in the received system information configuration for the SI message.
  • the sequence e.g., order
  • the sequence determines the respective start of the first time window for each SI message.
  • the SI messages are transmitted in time windows of varying length.
  • the system information configuration received by UE 110 may include additional information on the length of the time windows for each of the at least one SI message. Also then, it is possible for the UE 110 to infer the location of the time window, namely where it expects the at least one SI message to be broadcast.
  • the received system information is configuring (again) three SI messages with the above described periodicities of 8 radio frames, 16 radio frames and 32 radio frame respectively.
  • the length of each SI message is different, e.g., is individually configured in the system information configuration.
  • the exemplary first of the three SI messages with periodicity of 8 radio frames is indicated in the system information configuration to have a short time window length of 5 slot
  • the exemplary second of the three SI messages with periodicity of 16 radio frame is indicated in the system information configuration to have a longer time window length of 10 slots
  • the exemplary third of the three SI messages with periodicity of 32 radio frames is indicated in the system information configuration to have a long time window of 20 slots.
  • the UE 110 can infer for each of the three SI messages the radio frame in which it is to be broadcasted based on a system frame number (SFN) which is an integer multiple of the respective periodicity.
  • SFN system frame number
  • the UE 110 can determine the start (or starting point) of the first time window for each SI message as a slot with a number which corresponds to the position of the respective entry(ies) and the respectively indicated window lengths which are included in the received system information configuration for the SI message.
  • the sequence e.g., order
  • the sequence determines the respective start of the time window for each SI message.
  • system information configuration permitting a variably defined window length may be defined as follows:
  • SI-SchedulingInfo SEQUENCE ⁇ schedulingInfoList SEQUENCE (SIZE (1..maxSI-Message)) OF SchedulingInfo, si-RequestConfig SI-RequestConfig OPTIONAL, -- Cond MSG-1 si-RequestConfigSUL SI-RequestConfig OPTIONAL, -- Cond SUL-M3G-1 systemInformationAreaID BIT STRING (SIZE (24)) OPTIONAL, -- Need P ...
  • the processing circuitry 130 of UE 110 monitors (see, e.g., step 440 in FIG. 4 ) a search space (e.g., PDCCH containing the scheduling RNTI, e.g., SI-RNTI) for information regarding the scheduling of the at least one SI message.
  • a search space e.g., PDCCH containing the scheduling RNTI, e.g., SI-RNTI
  • the receiver 120 of the UE 110 is capable of receiving (also) within the first time window the at least one SI messages (e.g., transmitted on DL-SCH). For example, this reception operation may be performed by the reception is first information message receiver 220 - b.
  • the processing circuitry 130 of the UE 110 determines (see, e.g., step 450 in FIG. 4 ) at the end of the first time window that it is unsuccessful with receiving the at least one SI message, then disadvantageous implementations would require the UE 110 wait for the next one of the first time window that is reoccurring that the configure periodicity. This introduces a substantial delay into the SI message acquisition.
  • this determination operation may be performed by the first information message reception determination processing circuitry 230 - a.
  • the determination of an unsuccessful reception of a SI message for example, with the periodicity of 8 radio frames means that the UE will have to wait for 7 radio frames until it can at the start of the next first time window again monitor the common search space for scheduling information, and therewith receive the transmitted SI message.
  • the transmitter 120 of UE 110 transmits (see, e.g., step 470 in FIG. 4 ) a system information (SI) request for the at least one SI message after determining the unsuccessful receipt of the at least on SI message.
  • SI system information
  • this transmission operation may be performed by the system information request transmitter 220 - c.
  • the UE 110 directly transmits the SI request for the unsuccessfully received SI message, e.g., without waiting for another reception opportunity in the next first time window. Thereby, a delay for the UEs to receive SI messages is avoided, and the robustness of acquiring SI message is further improved.
  • each SI request (only) indicates the unsuccessful reception of one (single) SI message. And all the SI requests are commonly defined throughout the cell. Thereby, an adverse amount of collisions between or interference among different SI requests is mitigated. Due to the commonly definition of SI requests in the cell, transmissions from different UEs do not result in the loss of information.
  • SI requests For example, in case the reception of SI messages has been unsuccessful for a longer period of time, e.g., for an entire radio frame, then it is likely that plural, different UEs transmit SI request indicate the unsuccessful reception of same SI messages. With the common definition of the SI requests, there are however no adverse effects such as collisions or interference between SI requests which are indicating the unsuccessful reception of a same SI message.
  • the system information (SI) request is transmitted through a Random Access procedure using the PRACH preamble(s) and PRACH resource(s) in si-RequestConfig corresponding to the SI message(s) that the UE wants to acquire.
  • the PRACH preamble(s) and PRACH resource(s) for which the si-RequestConfig indicates a correspondence to SI message(s) permit signaling an according SI request.
  • the Random Access procedure also includes signaling (see, e.g., step 480 in FIG. 4 ) an acknowledgement for (short: ACK) in response to the SI request.
  • ACK acknowledgement for
  • the UE can proceed with the further procedure described below (e.g., preparing for receiving the SI message in a second time window).
  • the acknowledgement is signaled over PDCCH being scrambled with a common random access, RA, radio network temporary identifier, RNTI (RA-RNTI).
  • RA radio network temporary identifier
  • UE 110 monitors the acknowledgment from the system 160 . If UE 110 receives a positive acknowledgement for the SI request, the receiver 120 of UE 110 receives (see, e.g., step 480 in FIG. 4 ) the at least one SI message within a second time window, e.g., where the second time window is different from the first time window and occurs out-of-sequence when compared with the first time window which is reoccurring at the indicated periodicity. For example, this reception operation may be performed by the second system information message receiver 220 - d.
  • the second time window occurs after the above discussed elapse of the first time window where the SI message reception was unsuccessful and before the next of the first time window reoccurring at the indicated periodicity.
  • the second time window occurs in-between two subsequently occurrences of the first time window reoccurring at the indicated periodicity.
  • the processing circuitry 130 of the UE 110 monitors a search space (e.g., PDCCH containing the scheduling RNTI, e.g., SI-RNTI) for the information regarding the scheduling of the at least one SI message for which the SI request was transmitted.
  • a search space e.g., PDCCH containing the scheduling RNTI, e.g., SI-RNTI
  • the UE 110 receives such scheduling information, it is capable of receiving (also) within the second time window the at least one SI message for which the SI request is transmitted.
  • the processing circuitry 130 of the UE 110 determines (see, e.g., case “Y” in step 450 in FIG. 4 ) before the end of the second time window that it is successful with receiving the at least one SI message, then the SI message acquisition terminates.
  • the processing circuitry 130 of the UE 110 determines (see, e.g., step 450 in FIG. 4 ) before the end of the second time window that it is unsuccessful with receiving the at least one SI message, then it proceeds to monitor a further one of the at least one second time windows, or the UE waits (see, e.g., case “N” in step 450 and case “Y” in step 460 in FIG. 4 ) until the next one of the at least one first time windows, reoccurring at the indicated periodicity.
  • the system information configuration further indicates which SI message(s) is/are allowed to be broadcasted in the at least one second time window. In other words, with this indication it can be indicated that one or more SI message(s) are not allowed to be broadcasted in the at least one second time window. For such SI message(s), the UE will not transmit a corresponding SI request in response to the determination of an unsuccessful receipt within one of the at least one first time window, but instead will have to wait unit the next one of the first time windows for the reception thereof.
  • the scheduling information may be carried in one or more downlink control information (DCI) which is scheduling exactly one or plural, different SI messages, including the at least one SI message, within the (same) at least one second time window.
  • DCI downlink control information
  • exactly one DCI may be used to (simultaneously) schedule the plural different SI messages.
  • the exactly on DCI includes an indication which indicates each of the different SI messages which are scheduled within the (same) at least one second time window.
  • each of the plural DCIs includes an indication which indicates the respective one of the plural SI messages which are scheduled within the (same) at least one second time window.
  • a UE receiving the one or more DCIs is facilitated to (immediately) determine whether or not the scheduled SI message is corresponding to the SI which the UE has requested earlier. This facilitates the reception operations by the UE within the at least one second time window.
  • the UE(s) can infer the start or starting point for the second time window such that it subsequently follows (with or without a gap in-between) the last one of the three different first time windows within the current time interval. Therewith an overlap between all the three first time windows and the second time window within the same current time interval is avoided, irrespective of whether a SI message is broadcasted in each of the three first time windows or not.
  • the SI request triggers repetitions of the same at least one SI message in the plural second time windows.
  • the robustness of the SI message acquisition is further facilitated.
  • the time intervals in which the repeated transmissions may occur can have the numbers N, N+1, N+2, . . . N+N r ⁇ 1.
  • FIG. 5 shows the downlink (indicated as DL) activity and uplink (indicated as UL) activity in a cell served by the base station, BS. Since the illustration is focused on SI message acquisition, the presented level of information has been reduced in said respect. In other words, FIG. 5 shows time intervals, time windows, SI messages and SI request and their sequence in time.
  • the one or more UE(s) is capable of inferring first time windows for each of the three SI messages.
  • the first time windows are assumed to have a same window length.
  • the BS succeeds with occupying the channel (COT) such that the BS broadcasts the third SI message (SI msg. 3 ) in the time window W 3 .
  • the BS has indicated a configuration to the one or more UE(s) that it is permitted to defer the starting point of the additional time window W A .
  • SI system information
  • FIG. 6 further shows the downlink (indicated as DL) activity and uplink (indicated as UL) activity in a cell served by the base station, BS. Since the illustration is focused on SI message acquisition, the presented level of information has been reduced in said respect. In other words, FIG. 6 shows time intervals, time windows, SI messages and SI request and their sequence in time.
  • the downlink activity in form of an third SI message is depicted as arrow pointing downward with indication “SI msg. 3 ” whereas a SI request for a for a first and a second SI message is depicted as an arrow pointing upward with an indication “SI req. 1 , 2 .”
  • the embodiment illustrated in FIG. 6 assumes a scenario where there are three SI messages broadcast in a cell served by the BS.
  • a short periodicity is indicated in the system information configuration corresponding to the shown “SI period of W 1 .”
  • a medium periodicity is indicated in the system information configuration corresponding to the shown “SI period of W 2 .”
  • a large periodicity is indicated in the system information configuration corresponding to the shown “SI period of W 3 .”
  • the one or more UE(s) is capable of inferring first time windows for each of the three SI messages.
  • the first time windows are assumed to have a same window length.
  • the BS succeeds with occupying the channel (COT) such that the BS broadcasts the third SI message (SI msg. 3 ) in the time window W 3 .
  • the BS Having received the SI requests for the first and second SI message, the BS attempts to broadcast the requested SI messages (SI msg 1 , 2 ) in additional time windows within the next time interval t N+1 following the current time interval t N .
  • the additional time window for the first SI message within the next time interval t N+1 corresponds to what is indicated as time window W 1 within same next time interval t N+1 .
  • This time window W 1 within same next time interval t N+1 would, however, also normally have been used for broadcasting of a first SI message.
  • a situation can occur where the additional time window coincides with a (regular) time window within a same time interval.
  • the BS detects such a situation, it aborts (stops) the broadcasting of SI messages in response to the SI request.
  • the clear channel assessment performed by the BS, results (again) in a failure (no COT).
  • the failure to occupy the channel leads to a situation where the BS cannot broadcast the first SI message (SI msg. 1 ) in the time window W 1 . Only thereafter, the BS succeeds with occupying the channel (COT).
  • the one or more UE(s) determines that it has been unsuccessful with receiving the first SI message within time window W 1 .
  • the one or more UE(s) detects that the BS has (again) occupied the channel, it transmits a SI request for the first SI message (SI req. 1 ).
  • SI req. 1 The SI requests are transmitted in the uplink.
  • the clear channel assessment, performed by the BS is (again) successful and the BS proceeds to (again) occupy the channel (COT); thus, the BS may resume communication.
  • the BS neither the BS nor the UE(s) known in advance when this will happen.
  • the remainder of the time window W 2 is sufficient for the BS to broadcast the second SI message (SI msg. 2 ) in the time window W 2 .
  • the additional time window W A has a same window length as time windows W 1 , W 2 and W 3 .
  • the clear channel assessment, performed by the BS is (immediately) successful.
  • the BS (immediately) succeeds with occupying the channel (COT).
  • the BS Having received the SI requests for the first SI message, the BS attempts to broadcast the requested SI messages (SI msg 1 ) in an additional time window within this even further time interval t N+2 following the time interval t N+1 .
  • the one more UE(s) infers a starting point of the additional time window within this even further time interval t N+2 which is the same as the starting point of the time window W 1 for the first SI message within the time interval t N+1 in which the reception of the first SI message was unsuccessful.
  • the broadcasting of multiple repetitions of the same first SI message in plural additional time windows is not carried out. This results from the fact that the attempt to broadcast already one of said first SI messages within an additional time window is aborted (stopped) by the BS.
  • the SI request is transmitted in the time interval t N .
  • one of the additional second time window(s) for the repeated broadcasting of the second SI message occurs within the next time interval t N+1 , following the current time interval t N where the unsuccessful receipt of second SI message is determined.
  • the BS detects this situation and aborts (stops) the repeated broadcasting.
  • the BS resumes operation with again attempting and (also) successfully completing the regular broadcasting operation, namely the broadcasting of the second SI message within the time window W 2 reoccurring at the indicated periodicity.
  • a user equipment comprising a receiver, a transmitter and processing circuitry.
  • the receiver in operation, receives a system information configuration for at least one system information, SI, message, the configuration indicating a periodicity at which the at least one SI message is being broadcasted.
  • the processing circuitry in operation and using the receiver, determines that receiving the at least one SI message, to be broadcasted in one of plural first time windows that are reoccurring at the indicated periodicity, is unsuccessful.
  • the transmitter in operation, transmits a SI request for the at least one SI message after determining the unsuccessful receipt of the at least one SI message, wherein the SI request includes an indication of the at least one SI message to be broadcasted.
  • the unsuccessful receipt of the at least one SI message is determined within a current time interval, wherein the time interval corresponds to the shortest periodicity at which SI messages are configured to be broadcast, and, the at least one second time window for receiving one of the at least one SI message occurs within the same, current time interval,
  • the unsuccessful receipt of the at least one SI message is determined within a current time interval, wherein the time interval corresponds to the shortest periodicity at which SI messages are configured to be broadcast, and, the at least one second time windows for receiving one of the at least one SI message occurs within a next time interval following the current time interval.
  • the at least one second time window has a starting point within the same, current time interval which is different from the starting point of the one of the plural first time windows within the current time interval, the current time interval being where the unsuccessful receipt of the at least one SI message is determined.
  • the at least one second time window has a starting point within the next time interval which is same as the starting point of the one of the plural first time windows within the current time interval, the current time interval being where the unsuccessful receipt of the at least one SI message is determined.
  • the processing circuitry in operation and using the receiver, determines the starting point based on an indication received from a base station broadcasting the at least one SI message.
  • the indication is at least one of: a configuration indicating the maximum number of different SI messages broadcasted by the base station in a time interval, and a configuration indicating whether or not the base station is permitted to defer the starting point when broadcasting the at least one SI message.
  • the at least one second time window includes plural second time windows, and the SI request triggers repetitions of the same at least one SI message in the plural second time windows.
  • plural, different SI messages are received in form of a radio resource control, RRC, message having a transport block size, TBS exceeding 2,976 bits.
  • RRC radio resource control
  • the transmitter in operation, transmits the at least one SI message within at least one second time window which occurs after the one of the plural first time windows and before the next of the first time window that is reoccurring at the indicated periodicity, enabling the determination that receiving the at least one SI message is successful.
  • the technique of implementing an integrated circuit is not limited to the LSI and may be realized by using a dedicated circuit, a general-purpose processor, or a special-purpose processor.
  • a FPGA Field Programmable Gate Array
  • a reconfigurable processor in which the connections and the settings of circuit cells disposed inside the LSI can be reconfigured may be used.
  • the present disclosure can be realized as digital processing or analogue processing. If future integrated circuit technology replaces LSIs as a result of the advancement of semiconductor technology or other derivative technology, the functional blocks could be integrated using the future integrated circuit technology. Biotechnology can also be applied.
  • the present disclosure can be realized by any kind of apparatus, device or system having a function of communication, which is referred to as a communication apparatus.
  • Such a communication apparatus include a phone (e.g., cellular (cell) phone, smart phone), a tablet, a personal computer (PC) (e.g., laptop, desktop, netbook), a camera (e.g., digital still/video camera), a digital player (digital audio/video player), a wearable device (e.g., wearable camera, smart watch, tracking device), a game console, a digital book reader, a telehealth/telemedicine (remote health and medicine) device, and a vehicle providing communication functionality (e.g., automotive, airplane, ship), and various combinations thereof.
  • a phone e.g., cellular (cell) phone, smart phone
  • a tablet e.g., a personal computer (PC) (e.g., laptop, desktop, netbook)
  • a camera e.g., digital still/video camera
  • a digital player digital audio/video player
  • a wearable device e.g., wearable camera, smart watch, tracking device
  • the communication may include exchanging data through, for example, a cellular system, a wireless LAN system, a satellite system, etc., and various combinations thereof.
  • the communication apparatus may comprise a device such as a controller or a sensor which is coupled to a communication device performing a function of communication described in the present disclosure.
  • the communication apparatus may comprise a controller or a sensor that generates control signals or data signals which are used by a communication device performing a communication function of the communication apparatus.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
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EP19152357.0A EP3683999A1 (fr) 2019-01-17 2019-01-17 Équipement utilisateur et système pour effectuer des opérations d'émission et de réception d' information de système
EP19152357.0 2019-01-17
EP19152357 2019-01-17
PCT/EP2019/080385 WO2020147993A1 (fr) 2019-01-17 2019-11-06 Équipement utilisateur et système réalisant des opérations d'émission et de réception

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US20210345367A1 (en) 2021-11-04
JP7386873B2 (ja) 2023-11-27
EP3683999A1 (fr) 2020-07-22
EP3912296A1 (fr) 2021-11-24
CN113366788A (zh) 2021-09-07
WO2020147993A9 (fr) 2021-08-19
CN113366788B (zh) 2024-04-02
WO2020147993A1 (fr) 2020-07-23

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